New warning 4986 prevents clean compile at warning level 4 by GregM

Hi,

Thanks again for reporting this bug. We've fixed it, and the fix will be available in VC11.

As always, if you have any further questions, feel free to E-mail me at stl@microsoft.com .

Stephan T. Lavavej
Visual C++ Libraries Developer

Hi,

Thanks for reporting this issue. We've resolved it as Won't Fix for VC10, but we've marked it for consideration in a future release.

Warning 4986 is off-by-default. We test our headers extensively to verify that they compile cleanly under /W4 /analyze. (If they don't, then that's a bug.) However, we currently don't test them under /Wall (which contains a number of extremely noisy warnings that aren't intended for day-to-day use, like "function not inlined"), so they're generally not /Wall clean. We fix /Wall warnings when we can, but right now the bar for making changes to the compiler and libraries is too high for off-by-default warnings.

If you have any further questions, feel free to E-mail me at stl@microsoft.com .

Stephan T. Lavavej
Visual C++ Libraries Developer

Thanks for your response. We are routing this bug to the product unit who works on that specific feature area. The team will review this issue and make a decision on whether they will fix it or not for the next release.

Thank you,
Visual Studio Product Team

This should be built using Debug|Win32, as that's the one I reset the intermediate and output directories. The others have these set to directories above this directory.

I'm attaching a simple project that demonstrates it. It uses /Wall, so I'm guessing that /Wall is required here, not just /W4

Hello

Thanks for your feedback. But we could not repro this issue in our lab.
Checked crtdeb.h and new.h, we found:
crtdbg.h
line 1077 #pragma warning(suppress: 4985)
line 1078 _Ret_bytecap_(_Size) void * __CRTDECL operator new[](size_t _Size);
...
line 1095 void __CRTDECL operator delete[](void *);

new.h
line 72 _Ret_opt_bytecap_(_Size) void *__CRTDECL operator new(size_t _Size, const std::nothrow_t&) throw();
line 73 _Ret_opt_bytecap_(_Size) void *__CRTDECL operator new[](size_t _Size, const std::nothrow_t&) throw();
line 74 void __CRTDECL operator delete(void *, const std::nothrow_t&) throw();
line 75 void __CRTDECL operator delete[](void *, const std::nothrow_t&) throw();
line 76 #endif

line 78 #ifndef __PLACEMENT_NEW_INLINE
line 79 #define __PLACEMENT_NEW_INLINE
line 80 inline void *__CRTDECL operator new(size_t, void *_Where)
line 81         {return (_Where); }
line 82 inline void __CRTDECL operator delete(void *, void *)
line 83        {return; }
line 84 #endif

Could you please provide us with a demo project that can be used to repro this issue? And we will re-investigate.

Thanks,
Kylin.Ming

Thank you for your feedback, We are currently reviewing the issue you have submitted.

Thank you,
Visual Studio Product Team